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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a99f560db8310d70eb6e5f25bb9a53385ab73351c37465ef9d01bb93b4fcd09d' 
  AND token = 'BRlTv9OFLc9mzjV52ct3BLuWOd5yAd6brrQe/koEayI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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