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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5e5a3e99605674731bb21c381e1cc09980c8161131612594065bb8954fa116d4' 
  AND token = 'l34eNgAnTr6rVmUxYJz4dqLky1ZcHPatuy/JjEi39vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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