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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '209b140f4ffe6a01895ee75dd00ea808151d96d1549fc0df662b9d38a19f8cc6' 
  AND token = 'bOwjvU9zdM9HQ1iJazDR0waX7Sa416FCaScTVqF6oGk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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