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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '928d0cd09629c43603f24930114d457cb9515f8e23670184b34577addb7b888d' 
  AND token = 'd792jjTrI4LJHiEqAQKJGhKZo7udgu2typSOVZkElN8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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