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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af6eaac1f07280bd48e7e7ea6b68a0a90a6d7040fe5c98527495ad3734ee72eb' 
  AND token = 'puxMAc08z9j4PKBBKA0ElbQbr0I4LeK+MaqsDBQsy7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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