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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3e1f523831032a8b71fe826177ba9ee92cd5e66392ce7fc8d9c5393a52436ca' 
  AND token = 'xMF4ztSZgkBAaNjkcjSYfYVgRbIkQs5TH5tg6z49HSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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