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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea3ca7c3fa1f8c82eebd1f72c32b55329bace3ea1bc17211393d478a9818db5e' 
  AND token = '5k8XTkdKihUhwYoitw2j6jKQe8RxE6J+4Mse32V3bDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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