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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07bc48ac92ce2a0e8d462b72beb9a6ed654520b3b829ee743d8b8c26d36f94e0' 
  AND token = 'RCH99kaJ38WfvWj//5xaijc+smmAjC6IsJMLY0mo3Hs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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