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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2ec7edb71e5920d1056b63bcc0cf80626009b247b766906731e6676cdac0d658' 
  AND token = 'GeBkGR7xlJmJr8Oh231ECeACEIn6Fc2iCZM9gPuhGww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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