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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1585445b0ae1d2bf15d90b93082029c8c9a882f52afd5069776a72d23facf445' 
  AND token = '3sYE9m9VVYD/1yzISBM40Yw47jB4xlt4p7dVVzciRLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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