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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f995351ad616353a038812699f417afa935acfb600e1c862b82e1237e90d899' 
  AND token = 'M2gv467QP+Dg+h3l+ln44vG0Bb5LXRuNMvP0H1cOLwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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