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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd419b8a08954bbab58268c1505312ab28c35328590737759da69bff6f4c1e293' 
  AND token = 'h7yQHl1UEGhTg1v+EFelrR9eGz7Y61Xms9QktbJOUXs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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