SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02f3a6c944a51059a40b6d7bd8c702f26e998595671e9410e7ccce76a08329b' 
  AND token = 'oQ3CzR13a4ZXRTKryYA/I2FHJgUSw7xdtqEjinG1MZg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00078

JSON explain

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