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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caaed44ea9ad3c406ed8834807e18dd020565b6dafccc9fe4917681d69dbe5c3' 
  AND token = '+/DJW+zFgyGyOJsHNhKxPzoXb0apC/BwIMsroCJPUyw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00010

JSON explain

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