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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1aeb288e0f6964c1d4825a7e9ba650cb151380e27c96962c5b81da78dcb5869' 
  AND token = 'rXwD80yFoKqH8dkdQrnpE4ISxuR5lw/qtH3XIcIaUhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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