SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '074d53f80549a3ac36be6cf9986a807416e21b3816e189f4c3f58b426513601e' 
  AND token = 'qzdaFFEsj2ntYvUhrmuxZQ3Axrky0RI7ngVwtg2BE1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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