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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b41ce533915dbbc20ad6873cae9de5fd2bf4bb3edba0e5d1fd5ffe1b4a975b9' 
  AND token = 'Ce0hE3yV1VV3VfDyQfBXiqDG1VjdP2UUWWYT8tHM488=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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