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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac03f7cd5c9503ea63f80ff772c13fe6033e1ab211825a531a8c05898a117815' 
  AND token = '3KIe2K5+UJOoVxCV7qmX2aCpUE8vv4qH9pi7ryv7VqU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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