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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b46b56b620ea5301ca6be4c249c0d2f68ece8cb740a770ec558fd98cc8ecabf4' 
  AND token = 'qtRwvGrpQLzx5+VktMTPKK2MPKzO63dJ2qHLUo899e8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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