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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1d261997d498604cfdafc23d431b6783edec99c2608abf99142997ec430fa27c' 
  AND token = 'ytHfGpCFAaxnxvVkLom8tHKFaQpYp73OZIk3EyOsV+4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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