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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92d5df86edb30be15d3ba7aed46ace89de48796e4afcd3a27e992971281cb295' 
  AND token = 'NEgLOsWMtA8AUYJsXqyJbO8NUjNhfFO9sdD8UEEcoRU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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