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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '753d16d94444f37365dab0dc130d825bc3e3edb14df03953aaacad0ee6e0f018' 
  AND token = 'n5hQVZJGc756LtAPCfbu6kW5GYcJywtCc6aVEqS1Mwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}