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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e4331471a0b8c582d01bc8105c201283627df71e454fb57f7f5a506670343aca' 
  AND token = 'X11YN3Z9bD5MF6Iz7JY6P9+u48I7TPjNDvv6iRX2TfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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