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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '40cfecaba4965e5f0be6a43473642e8aa4620267931ca5e8c9c49a34aa6907bb' 
  AND token = 'zrYnLn5ZG2WJfdNa9d2VOgQdj0tUZpNic5sc/fG69/k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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