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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd29809edeec2b7ac670c1ef657c15b6ebd22bdcf6aade3466e381febd85fa9d9' 
  AND token = 'VZ/VyeLHdRGX5wP6xO/MIC9GVvOmkhw0/1ZZ2sRMdmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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