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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e2e713b9e222e1b23e3cf9702d64499fde96e5076f7556cd20540ff6752cd5' 
  AND token = 'oOvXtOceZ4JyFqQd29bv4Pa84LkKAyAQjwCWPu2q69k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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