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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '119858f4d58ac8fb1be04ba1981f322830e446b45cb4befa9770cebfb43a473d' 
  AND token = 'JbwFHD/rpD48eJQxs79EfPSZV3YvVYXE+P/9f3ZzMlQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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