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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49982ed473b7cbe0e54003b4b597da69ba180d866b24af5abc7cfb6bb6f358f9' 
  AND token = 'f4GcU+SFSOw8zG9GIeKMKEHfRuX915yUgVg1LjesNJo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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