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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0b2fa7b669ed3d4b97c6dd71652a43c03256ee330c05df5f63a3393f45693b11' 
  AND token = 'wCxdZglNtJHtKTGRXZPuJfHXDr6CHbd4EO6Fr0u47OQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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