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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9cc57f85cde92fcd727d80642e9032fff7140d4f2c4fe4b9c9838a5c481ea940' 
  AND token = 'n7VIJljLFZu6y4bK70KbP6MjDk/3XNCks10WQoaDF2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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