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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef991ce52a60bdb3180bd8cfdf3ec4017aefbe108072e7d1ff7f9eac67b935e9' 
  AND token = 'Fuz7TmWpcR4y1JxXztOOf1341canly1HJN5Bu9Jf5C4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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