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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc6139471e91ae901396f7fbe06aca1f8d0ba8d28a594eaf8201b423a64b5b92' 
  AND token = 'qkutfzeWOzqme+OwsKk6UpnSbq6JH+vLfkKAjY2dlWA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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