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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '79449e697b0247d3197385f75da2921a31ac10a1fcc1775cff1fbc2ed65b4e2f' 
  AND token = 'TcbbXG4jpSJp7WRocJknsjQOtWz8AGkZpNg3w6o7w3w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00061

JSON explain

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