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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b33c0ff7865f2314d0fec57982a8f5d808a01c1dc4721eb50a86d1df74658a7e' 
  AND token = 'xzqOrX8vPfdFrNY5dg1Ea48trf9gL8C1AF66JMEjTdI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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