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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9deb04eabf0db134e4ed6c93c0a346680d847c7cb77ec3c53c6ca1f0845b8aa0' 
  AND token = 'W5pcMBbvhO+/dqs5I5BYc5kzHSdN8QN74EgO2JmX2M0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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