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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bde837314a69d6e4267feac2e6165db5ee49a895c7030756ec6ced6e70d8a3' 
  AND token = '09U3jQwPkf2X0EBJbAG1ajeyD+WzkANjzwPURL1WmBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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