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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a4a276c5946578498278ac280b5b5b49fdfc8e2ba81e41d52445c885eda6db' 
  AND token = '10sGC4B0NuiJP4q6OjML1ZV7e2BN2eJa1F9GzJsKhb4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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