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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '712416f7203eb8a8a7a4e197c035b6f3d280c8e7db55a57253e66482d2d1ca93' 
  AND token = 'JnHYZ3gqY7u3tutX5g2t6EzGs3uS8cu4uGR9NIs5t9A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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