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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '15aebf84eceae31a13ac16ea8e0f40ec936a30d21e24f07f3ff995215d875059' 
  AND token = 'CmsPzDF1q8vAEG7jw6VQtyW17g5q0at3BKY+qVUA6a8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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