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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95d0ee30678664deac945c930bf880b95185d7caa56eaa7a8509eae16d4df466' 
  AND token = '7aBOE0005a/TIF6lzW5l3JgGd94mDK0251bU5RYCEBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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