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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ccc6a45eaf4cb906e4efbed84be7c3ae354e5e43d441b71e0df4320f8ed3fe5' 
  AND token = 'N46jnaTfQRCBU2KA5a/ims2rj4qqJ3f/ryISBSINqKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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