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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2daddc4f566c49e7ebd3257a9c560ad0ecee3869add07f6200a4e27b9de59313' 
  AND token = '9YQEBaVYmUlMiUUh3nRa0IlVhyXtx8Bu9EyMX7dveQY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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