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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df6abd84b9b7c6143c7aabe3a1c27cb3ba8cf9e66859b52605ce35001ef81658' 
  AND token = 'ZJXv/ipGX5xT0v7HUZYAe5PURNsTzC0tWXr0nfI/gxw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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