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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f83735e194e646d6b21c923a7b995516ec3204a5ca9296adbb4bbe6e28319ca3' 
  AND token = 'nwy5NjNQxZQ0KdqYUC5aKZljyWBZMlqsG9OWICOkLD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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