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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a42df1912c339b3efd12e4ddacc4f256577d24277849777e9ec69651f208ddcd' 
  AND token = 'FA27BGb/k3FkGdUAVD885hQrVzxH7VbtLZOiXeiQmzU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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