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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdda93b8a8518856f8da484ae0492af96874aa3b1862257b88004780a1372924' 
  AND token = 'ZythXkmVN2tW8KF3Wrst2XgKLsZpy9Utk89oRZox8ls=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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