Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'da44185e04ac4d77da8a91ccc4a54eea06b9ac6d1c5b7c9923d91d52edff0b7a' 
  AND token = 'GooVzMieyUgunm1rFQUFaILn+5iNKJmYImTwYpXF8/Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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