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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de3e9f8355e77cb5ffdb7ffcae3bf6dd098423565f160364f0f4ad9d20ed194a' 
  AND token = 'Gbrh9aauJBjLJe9RJZhyWSfJCWzVHwW0TCsW3tcYAds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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