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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0deb016696477b2908c697b9b7b690e96538c982471f674ab3d55192b9a93735' 
  AND token = 'rJLBC+KlTi6IQNCAtIvKlHtS9Zb9eaoVBN0H6ReGPrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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