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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '978548b2f78d515c2a6fc120fb7ecf946afc39d6d1f8c61e4fd02f874311c1e9' 
  AND token = 'JeoUNzMoBXhC/ouN/An7OPlsDypmdsT3R115TJVl6I8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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