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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1aa7f17959e8c1234666e8821f4c8113f9a07357b0bec936fffc1c39e95ba704' 
  AND token = '6PppEAxk9Xxg0LAx4zkPo/YtvlglFD8D6DTJ1lYf/zE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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