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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc42b771630272e15431c62d224b7d3ae4e86796e9da75c0320bad677300af8e' 
  AND token = '9kmctxQ+MBJ6luArRFLfWZ/KTr6jp9NaDJJF9etN1X4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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