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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4e8350e03d495a8f99610908fded29c3b2d5c0e63088e507d0b989b151e1eae5' 
  AND token = 'jgW/lV5W6SMbkiUm0a8mo1T/IUFct5aWaWmXprUvMJw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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