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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96de723e9a43a36164c59faacf4a42cb79245c508fdf6148a91990e4c25a9c14' 
  AND token = 'mqRlNUMXHMxg0fP6EK8VqJ9KQNiarM5M2PVIREX6vO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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