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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3c9be2ede365502c94951c3258f86a3093c148510e9b25513dd1f9480a98b0e2' 
  AND token = 'S2KO/ROz2iPJw7lU3Q9ssL1b0rViefDOgfm1HsP8u6k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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