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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '46f373d31ed2d8230e3c04e9564c22765ae72f12f5feda6d3498d0e8c17b9ebc' 
  AND token = '9NTc+8vJF0gfACcgQOWCx8WXRrgf6BEcpalSG6ywpEk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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