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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '157e8082f083d93b94618f352bcd960a8bbb84d3130da1cdcb71424155dfbab6' 
  AND token = 'iDn1BhfQS/8YgJin6v+htPxAj1XFuR4f/XdCna46M1o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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