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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3469dc751f71e040f5172a1fe13853ebe5642604f957e4ddf42a3efe6db7fde6' 
  AND token = '98UagWNOA0qDRubjlFc5rF1WYMpAOSNx+tJxZi56P6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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