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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a39c5b93474c1ec98268f40ec304051d60f3b90b79ce986f432854f98482f6c' 
  AND token = 'Y2LYeN9lN4yEIwX+9Nadr8nfepvV+tRv9qesj0tA1ps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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