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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a562a4badfff5afedc782c4f5bb1c2af483438c1024131be60c82e46df41a910' 
  AND token = '3l7n8WlzLDPItszOabxp7Wx1gksja4YZHOSWqEg1Vu4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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