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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3af7de86aa4c3019ccfcc7342ddbaa579328ac09bc2bc7489b909b96b8c9bc3' 
  AND token = 'aaFbzTeMJ3sTwAp5omqfQULNpUjAF31Q3qEvComBFlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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