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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d4e95e5548e6f5de7859e5e3cb182132c0683dd29b08b6c5c4dca2f9b53b9df' 
  AND token = '5dLY9uQMl9jJETQRNerDUf/RbSYYJvL4SEWMBTYoR14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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