SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9002cc44f0a4192e297ef232aa6b56078f47b3257a137b734134858e81e02cfc' 
  AND token = 'KbQR5KMz+L/T3jPX+G1wVGFaCgi67oZIkXU3HNZqtug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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