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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd336e96b1e738b1d2fd6fb9b322dae685606d779f07fda7d8305643bf2aedbc5' 
  AND token = 'J3anogAgdZuGi+meoq3jrB4onLRg7iSexDToOr2+hVQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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