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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '215cb735c927a59bffe79572a2068dbfb0d7d2bb40a39ecbd3e061bbd9d8ddd0' 
  AND token = 'jRCU5YpY+7XAohd/ttw9CKq6M18NBmsHqg2k0LOCL2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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