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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19cdeea460c04a585b1d4fe955020d257d36d81c51d46ff8759ebafa525543fa' 
  AND token = 'ZV/8nDO9FcpTwADVC/+aZlzBsXiONOzZebYX7aqKCeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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