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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2c299c64ef6d9222191c4ac45de5f4cbacb5b6a9337e21ed03795adbe2e36f97' 
  AND token = 'AVNUcfmhRFedTy5LG9O0wg20E9fFGZtEjvtZWdd3HMA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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