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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db996e812c2edbb34931dd0d5573f10c2c058572efd9d8e3415d341ce3db1d9a' 
  AND token = '2r4hR3P43Xxq7B9LE0kUo48u64msBOByrq++gEtK9Qc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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