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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6acb98a4997ef7fe87f1a9786db3db8d360c4f9072661875e64f6d94d647684' 
  AND token = 'xcpCo6+g9NG4EbFyVNJjW28D2d7L8ETAXz6n3v3i64k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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