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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5aece51e6c1e3dc74ff768a19f32727bffd838053dbd14bb7342acfda8d70574' 
  AND token = '5eO+cIBWwyY3/RipahsMW6XqF4klBjif/iS2EFiPTSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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